Error in Document Tree with finder

DocumentTree with finder=true does not work properly.
For certain existing pages always work but for others always fail.
No problem with non-existing pages, returns correctly "Not found"

When failing the following is logged:
Caused by: org.apache.velocity.exception.MethodInvocationException:
Invocation of method 'subList' in class java.util.ArrayList threw exception
java.lang.IllegalArgumentException: fromIndex(0) > toIndex||(-1) at
48:documentationbss:XWiki.DocumentTree[line 1384, column 48]

As Marius Dumitru suggested in email:
"Looks like a bug. The finder returns results (suggestions) that are not in
the tree and thus for which the tree fails to compute the path."